College of Science Al-Mustanseiriyah University Dep.: Biology
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1 College of Science Al-Mustanseiriyah University Dep.: Biology Academic year: Subject: Plant taxonomy Class: Third Grade Lecturer:Dr.Hadeel R.,Dr.Rana A.,Dr.Aseel M.,Dr.Zena K. Lecture: 6 ***Fruits: Fruits are the mature ovaries or pistils of flowering plants plus any associated accessory parts. **Accessory parts: are organs attached to a fruit but not derived directly from the ovary, including the bracts, axes, receptacle. **Pericarp: is the fruit wall, derived from the mature ovary, sometimes pericarp divided into layers: 1- endocarp 2- mesocarp 3- exocarp ****Fruit types: are based first on fruit developed : 1- Simple fruit: derived from a single pistil of one flower. 2- Aggregate fruit: derived from multiple pistil of a single flowers, thus having an apocarpous gynoecium. 3- Multiple fruit: derived from many coalescent flowers. ***Simple fruits: 1- Achene: is a one-seeded, dry, indehiscent fruit with seed attached to the pericarp at one point only as in sunflower. 2- Grain (or caryopsis): is a one-seeded, dry, indehiscent fruit with the seed coat adnate to pericarp wall as in poaceae family.(like wheat). 3- Nut: is a one seeded, dry, indehiscent fruit with a hard pericarp. 4- Samara: is a winged, dry, usually indehiscent fruit as in Acer. ١
2 5- Urticle: is a small, bladdery or inflated, one-seeded, dry fruit, utricles are essentially achenes in which the pericarp is significantly larger than the mature seed as in Atriplex (salt bush). 6- Capsules: are generally dry, dehiscent fruits derived from compound ovaries, several types of capsule can be recognized based on the type or location of dehiscence:- A/ Loculicidal capsules: have longitudinal lines of dehiscence radially aligned with the locules or between the placenta if septa are absent it splits into valves. B/ Septicidal capsules: have longitudinal lines of dehiscence radially aligned with the ovary septa( or with placenta if septa are absent). Its splits into valves. **Valves: apportion of the pericarp wall that splits off, but does not enclose the seed, valves may remain attached to the fruit or may fall off. C/ Circumscissile capsules: (also called a pyxis) has a transvers (as opposed to longitudinal) line of dehiscence, typically forming a terminal lid as in Plantago. D/ Septifragal or valvular capsules: is one in which the valves break off from the septa, as in Lpomoea (morning glory). E/ Poricidal capsules: have dehiscence occurring by means of pores as in Papaver. 7- Follicle: is a dry, dehiscent fruit derived from one carpel that splits along one suture, such as in unit fruit of Magnolia. 8- Legume: is a dry, dehiscent fruit derived from one carpel that splits along two longitudinal sutures as in fabaceae. 11- Silicles and siliques: are dry, dehiscent fruits derived from a two carpeled ovary that dehisces along two sutures but that has an outer rim. ٢
3 12- Scizocarp: is a dry, dehiscent fruit type derived from a two or more loculed compound ovary in which the locules separate at maturity. 13- Berry: is the unspecialized term for a fruit with asucculent pericarp as in Vitis (grape). 14- Drupe : is a fruit with a hard, stony endocarp and a fleshy mesocarp, as in Prunus. 15- Hesperidium: is a septate fleshy fruit with a thick skinned, leathery outer pericarp wall and fleshy modified trichomes (juice sacs)arising from the inner walls, as in Citrus(orange, lemon, etc.). 16- Pepo: is a non septate fleshy fruit with parietal placentation and leathery exocarp derived from an inferior ovary, as in cucurbtaceae. ٣
4 ٤
5 ***Aggregate fruits: is one derived from two or more pistils (ovaries) of one flower:- A/ Achenecetum: is an aggregate fruit of achenes. A common example is Fragaria( strawberry), in which the achenes are on the surface of accessory tissue, an enlarged, fleshy receptacle. B/ Drupecetum: is an aggregate fruit is an aggregate fruit of follicles as in Magnolia. C/ Syncarp: is an aggregate fruit, typically of berries, in which the fruits fuse together, as in Annona (note that syncarps may form at the floral stage or later during fruit development, if the latter, the fruit is sometimes called a pseudosyncarp. *****Multiple fruits: is one derived from two or more flowers that coalesce. Types of multiple fruits:- 1- Sorosis: is a multiple fruit in which the unit fruits are fleshy berries and are laterally fused along a central axis as in Ananas( pineapple). 2- Syconium : is a multiple fruit in which the unit fruits are small achenes covering the surface of a fleshy, inverted composed receptacle (derived from a hypanthodium) as in Ficus. ٥
6 ****Seeds: Aspects of seed morphology can be important systematic characters used in plant classification and identification. Parts of ssed is: 1- Seed coat: the outer protective covering of seed derived from the integument. Seed coat consist of two fused layers: a/ testa b/ tegmen ***sarcotesta: a seed coat that is fleshy at maturity. 2- Hilum : the scar of attachment of the funiculus on the seed coat. 3- Raphe: a ridge on the seed coat formed from an adnate funiculus. **Embryo: is the immature sporophyte, it consist of: A/ Epicotyl : the immature shoot. B/ Radical: the immature root. ٦
7 C/ Hypocotyl: the transition region between the root and epicotyl. D/ Cotyledon: the first leaf/leaves of the embryo, often functioning in storage of food reserves. ٧
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